This is a bit of by product from the Spider-Man: Homecoming 2 news from yesterday.
According to Variety, to make way for that film which is coming July 5th, Sony have decided to move up the release of Bad Boys 4. That will now open on Memorial Day Weekend on May 24, 2019.
Bad Boys 4 will follow up Bad Boys For Life, which is going to be releasing January 21st 2018, which has both Will Smith and Martin Lawrence back in their roles, with Joe Carnahan directing. That's two Bad Boys movies just over a year apart, which will be nice for fans, especially considering the gap between the last film and the upcoming one.